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Paper Abstract and Keywords
Presentation 2010-03-01 11:50
Adaptive Minimum Filter for Precise Time Synchronization on IP Networks
Satoru Ohta (Toyama Pref. Univ.), Hitoshi Uematsu, Kan Toyoshima, Kenji Hisadome, Mitsuhiro Teshima (NTT Corp.) CAS2009-95 SIP2009-140 CS2009-90
Abstract (in Japanese) (See Japanese page) 
(in English) In a time synchronization protocol over IP networks, such as NTP (Network Time Protocol), the time offset is evaluated by measuring the Round Trip Time (RTT). In this method, to avoid the estimation errors caused by delay variation, the minimum filter technique is employed. For this technique, it is necessary to appropriately select the number of samples, from which the minimum value is selected, with considering the trade-off between filtering effect and stability. This paper investigates on an adaptive minimum filter, which controls the number of samples depending on the variation of RTT values. The adaptive minimum filter is applied to the time synchronization and the time accuracy is evaluated through computer simulation. The simulation result shows that the adaptive minimum filter achieves good time accuracy in comparison with the conventional technique.
Keyword (in Japanese) (See Japanese page) 
(in English) time synchronization / round trip time / IP networks / delay variation / filter / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 436, CS2009-90, pp. 99-104, March 2010.
Paper # CS2009-90 
Date of Issue 2010-02-22 (CAS, SIP, CS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF CAS2009-95 SIP2009-140 CS2009-90

Conference Information
Committee SIP CAS CS  
Conference Date 2010-03-01 - 2010-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel Breeze Bay Marina, Miyakojima 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal processing for networking and communications, and others 
Paper Information
Registration To CS 
Conference Code 2010-03-SIP-CAS-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Adaptive Minimum Filter for Precise Time Synchronization on IP Networks 
Sub Title (in English)  
Keyword(1) time synchronization  
Keyword(2) round trip time  
Keyword(3) IP networks  
Keyword(4) delay variation  
Keyword(5) filter  
1st Author's Name Satoru Ohta  
1st Author's Affiliation Toyama Prefectural University (Toyama Pref. Univ.)
2nd Author's Name Hitoshi Uematsu  
2nd Author's Affiliation NTT Network Innovation Laboratories, NTT Corporation (NTT Corp.)
3rd Author's Name Kan Toyoshima  
3rd Author's Affiliation NTT Network Innovation Laboratories, NTT Corporation (NTT Corp.)
4th Author's Name Kenji Hisadome  
4th Author's Affiliation NTT Network Innovation Laboratories, NTT Corporation (NTT Corp.)
5th Author's Name Mitsuhiro Teshima  
5th Author's Affiliation NTT Network Innovation Laboratories, NTT Corporation (NTT Corp.)
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Date Time 2010-03-01 11:50:00 
Presentation Time 20 
Registration for CS 
Paper # IEICE-CAS2009-95,IEICE-SIP2009-140,IEICE-CS2009-90 
Volume (vol) IEICE-109 
Number (no) no.434(CAS), no.435(SIP), no.436(CS) 
Page pp.99-104 
#Pages IEICE-6 
Date of Issue IEICE-CAS-2010-02-22,IEICE-SIP-2010-02-22,IEICE-CS-2010-02-22 

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